Enter a clue or pattern or both:
The Clue
Bygone barrier breakers (4 letter answer)
The Answer
SSTS
Tags
Notes
The answer SSTS is very common and appears about once every 46 puzzles.
Related Clues
Concorde et al.
Concordes
Boom makers
Bygone fliers
Concordes, briefly
Concordes, e.g.
Fast fliers
Fast jets
Fast planes
Former fliers
Frequent fliers
Heathrow visitors
High fliers
Jets that boom
Kennedy arrs.
Orly birds?
Sleek streakers
Soaring swifties
Speedy jets
Speedy planes
Swift planes
Visitors to J.F.K.
Bygone J.F.K. landers
Discontinued fliers, quickly
Fleet fleet, once
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Onetime Aerospatiale products
Onetime French fleet
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Transporters since '76
Jet-setters' jets, once
Planes once barred from J.F.K.
They were retired in '03